CN114112074B - Flame detector light path self-checking method and device and flame detector - Google Patents
Flame detector light path self-checking method and device and flame detector Download PDFInfo
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- CN114112074B CN114112074B CN202111467416.0A CN202111467416A CN114112074B CN 114112074 B CN114112074 B CN 114112074B CN 202111467416 A CN202111467416 A CN 202111467416A CN 114112074 B CN114112074 B CN 114112074B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
- G01J5/0018—Flames, plasma or welding
Abstract
The invention relates to the technical field of flame detectors, and particularly discloses a flame detector optical path self-checking method, which comprises the following steps: acquiring a noise signal of the pyroelectric sensor in real time; determining a current flame detector state; when the flame detector is in a calm state, judging whether the window is polluted according to whether the pyroelectric sensor receives the infrared signals of the light source or not; judging whether the flame detector is in a non-calm state or not currently in a rainy day; if the judging result is that the window is currently in a rainy day, judging that the window is affected by rainwater and is not polluted, and shielding a self-checking fault signal of the flame detector; and if the judgment result is that the flame detector cannot be identified and the pyroelectric sensor does not receive the infrared signal of the light source, controlling the flame detector to reenter a calm state. The invention also discloses a flame detector light path self-checking device and a flame detector. The flame detector light path self-checking method provided by the invention can effectively avoid the influence of rain invasion on the detector from false alarm of fault signals.
Description
Technical Field
The invention relates to the technical field of flame detectors, in particular to a flame detector optical path self-checking method, a flame detector optical path self-checking device and a flame detector.
Background
The multiband infrared flame detector is an instrument for detecting energy fluctuation of infrared signals with different wave bands in a measured environment by utilizing a pyroelectric sensor so as to identify flame. The device consists of a shell, a window, a pyroelectric sensor, a signal modulation circuit, an instrument output circuit and the like, wherein the detection of the pollution degree of the window is a necessary function in all multiband infrared flame detectors. The pollution of the window can directly influence the flame detection range of the multiband infrared flame detector, and the monitoring capability of the infrared flame detector on the flame can be reduced or even blocked. Therefore, most manufacturers in the current market can take corresponding measures for detecting the window pollution degree of the multiband infrared flame detector, which is not only the requirement of on-site clients, but also the necessary function of future flame detectors, and the new flame detector national standard report of GB 12791 also increases the test of the function.
Currently, the detection of the pollution degree of the window of the flame detector of all factories (hereinafter referred to as 'optical path self-detection') generally adopts the following optical structure: the infrared light source, pyroelectric sensor and specular reflector, as shown in fig. 1, the infrared light source emits infrared signal, and the penetrating window shines on the specular reflector, and then is reflected by specular reflector, and penetrating window shines pyroelectric sensor, and pyroelectric sensor judges window pollution's degree through the energy size of the infrared signal of absorption. When the energy of the infrared self-checking signal sent by the instrument is reduced to a certain threshold value after the infrared self-checking signal is absorbed by the pyroelectric, the instrument sends out a window pollution fault signal to prompt on-site operators to clean the window of the instrument. The optical structure is simple and practical, and is widely applied to flame detectors. However, this design has a fatal defect that when the window surface is exposed to rain in rainy days, the optical path self-checking structure is destroyed, the infrared signal emitted by the infrared light source cannot be emitted to the surface of the pyroelectric sensor, so that the false window pollution is caused, the instrument emits a fault signal, but the capability of the multiband infrared flame detector for detecting the flame is not affected, which is contrary to the original purpose of the design, and the instrument is in a fault state and must be processed, but cannot solve the problem. To this disadvantage, manufacturers of flame detectors may recommend adding a rain shield, but the rain shield itself will block the viewing angle of the flame detector, and when the rain is too great or there is wind, the rain will still wet the window surface, and the meter will send out a fault signal.
Therefore, how to provide a light path detection method for outputting a fault signal without being affected by rain attack of a detector is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a flame detector light path self-checking method, a flame detector light path self-checking device and a flame detector, which solve the problem that false alarm of a fault signal caused by the influence of rain water invasion of the flame detector cannot be avoided in the related technology.
As a first aspect of the present invention, there is provided a flame detector optical path self-inspection method, which is applied to a flame detector including a window, an infrared light source, a pyroelectric sensor, and a specular reflector mounted thereon, the infrared light source and the pyroelectric sensor being disposed at one side of the window, and the specular reflector being disposed at the other side of the window, the flame detector optical path self-inspection method comprising:
acquiring a noise signal of the pyroelectric sensor in real time;
determining the state of a current flame detector according to the comparison result of the noise signal and a preset noise threshold value, wherein the state of the flame detector comprises a calm state and a non-calm state;
when the flame detector is in a calm state, judging whether the window is polluted according to whether the pyroelectric sensor receives the infrared signals of the light source or not;
judging whether the flame detector is in a non-calm state or not currently in a rainy day or not;
if the judging result is that the window is currently in a rainy day, judging that the window is affected by rainwater and is not polluted, and shielding a self-checking fault signal of the flame detector;
and if the judgment result is that the identification is impossible and the pyroelectric sensor does not receive the infrared signal of the light source, controlling the flame detector to reenter a calm state.
Further, the determining the state of the current flame detector according to the comparison result of the noise signal and a preset noise threshold value includes:
comparing the noise signal with a preset noise threshold;
if the noise signal exceeds the preset noise threshold, judging that the state of the flame detector is a non-calm state;
otherwise, judging the state of the flame detector to be a calm state.
Further, when the flame detector is in a calm state, judging whether the window is polluted according to whether the pyroelectric sensor receives the light source infrared signal, including:
when the flame detector is in a calm state, judging whether the energy of the light source infrared signal absorbed by the pyroelectric sensor exceeds a preset energy threshold;
if yes, judging that the pyroelectric sensor receives the light source infrared signals and judging that the window is not polluted;
if the infrared signal is not exceeded, the pyroelectric sensor is judged to not receive the light source infrared signal, and the window is judged to be polluted.
Further, when the window is judged to be polluted, a self-checking fault signal is sent out.
Further, the determining whether the current weather is rainy includes:
constructing a rainy day recognition model;
judging whether the rainy day is currently in the rainy day or not according to the rainy day identification model.
Further, the building of the rainy day recognition model includes:
respectively acquiring noise signals of the pyroelectric sensors of the flame detectors after the simulated rain test to form a first acquisition sample;
respectively collecting noise signals of pyroelectric sensors of a plurality of flame detectors under actual different rainy days to form a second collected sample;
performing Fourier change on the first acquired sample and the second acquired sample respectively, and extracting a frequency domain characteristic value;
comparing the frequency domain characteristic value of the first acquired sample with the frequency domain characteristic value of the second acquired sample;
and determining a rainy day recognition model according to the comparison result.
Further, the building of the rainy day recognition model includes:
respectively collecting noise signals of the pyroelectric sensors of the flame detectors in a calm state to form a calm sample;
respectively collecting noise signals of pyroelectric sensors of a plurality of flame detectors under actual different rainy days to form a rainy day sample;
training the calm sample and the rainy day sample according to a neural network algorithm;
and determining a rainy day recognition model according to the training result.
Further, the flame detector optical path self-checking method further comprises the following steps:
and when the flame detector is in a non-calm state and is currently in a rainy day, compensating the noise signal of the pyroelectric sensor.
As another aspect of the present invention, there is provided a flame detector optical path self-checking device for implementing the flame detector optical path self-checking method described above, wherein the flame detector is applied to a flame detector, the flame detector includes a window, an infrared light source, a pyroelectric sensor and a mirror reflector mounted thereon, the infrared light source and the pyroelectric sensor are disposed on one side of the window, the mirror reflector is disposed on the other side of the window, the flame detector optical path self-checking device includes:
the signal acquisition module is used for acquiring the noise signal of the pyroelectric sensor in real time;
the state determining module is used for determining the state of the current flame detector according to the comparison result of the noise signal and a preset noise threshold value, wherein the state of the flame detector comprises a calm state and a non-calm state;
the judging module is used for judging whether the window is polluted according to whether the pyroelectric sensor receives the light source infrared signals or not when the flame detector is in a calm state;
the rainy day identification module is used for judging whether the flame detector is currently in a rainy day or not when the flame detector is in a non-calm state;
the judging module is used for judging that the window is affected by rainwater and is not polluted if the judging result is that the window is currently in a rainy day, and shielding a self-checking fault signal of the flame detector;
and the control module is used for controlling the flame detector to reenter the calm state if the judging result is unrecognizable.
As another aspect of the present invention, there is provided a flame detector, including: the device comprises a window, an infrared light source, a pyroelectric sensor, a mirror reflector and the flame detector optical path self-checking device, wherein the window, the infrared light source, the pyroelectric sensor, the mirror reflector and the flame detector optical path self-checking device are arranged on the window, the infrared light source and the pyroelectric sensor are arranged on one side of the window, the mirror reflector is arranged on the other side of the window, and the pyroelectric sensor is in communication connection with the flame detector optical path self-checking device.
According to the flame detector light path self-checking method provided by the invention, infrared signals of different environments are monitored by utilizing the pyroelectric sensor in the flame detector, and the environment of a rainy day can be identified, so that the detector can judge whether a window is blocked by utilizing the acquisition of the infrared background of the rainy day, thereby realizing the multi-band infrared flame detector, avoiding the influence of rain invasion on the detector and outputting fault signals when the light path self-checking function is realized, further overcoming the defect of the light path self-checking function of the traditional flame detector, perfecting the function of the light path self-checking, and ensuring the pollution degree of the window to be detected more accurately; and the stability of the flame detector is improved, and the maintenance cost and the accessory cost of the flame detector are reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a schematic diagram of a self-checking structure of an optical path on a flame detector according to the present invention.
FIG. 2 is a flow chart of the flame detector optical path self-checking method provided by the invention.
FIG. 3 is a flowchart of an embodiment of a method for self-checking an optical path of a flame detector according to the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a self-checking method for the optical path of a flame detector is provided, which is applied to the flame detector, as shown in fig. 1, wherein the flame detector comprises a window 10, an infrared light source 30, a pyroelectric sensor 20 and a mirror reflector 40, the infrared light source 30 and the pyroelectric sensor 20 are arranged on one side of the window 10, and the mirror reflector 40 is arranged on the other side of the window 10.
It should be noted that the flame detector according to the embodiment of the present invention is specifically a multiband flame detector. The structures such as the window, the infrared light source, the pyroelectric sensor, the mirror reflector and the like included in the flame detector described above should be understood as structures mainly realizing the optical path self-checking function, but the structure of the flame detector is not limited to the above-mentioned components, and the structure of the flame detector for realizing the flame function, such as a shell, a signal modulation circuit, an instrument output circuit and the like, is also included, and the structural components and the working principle for specifically identifying the flame function are well known to those skilled in the art and are not repeated herein.
Fig. 2 is a flowchart of a flame detector optical path self-checking method according to an embodiment of the present invention, as shown in fig. 2, the flame detector optical path self-checking method includes:
s110, acquiring a noise signal of the pyroelectric sensor in real time;
it should be understood that, since the multiband flame detector installed outdoors is susceptible to rain attack, and the pyroelectric sensor used in the flame detector has a very stable signal, in addition to rain interference and infrared background noise interference, approaching the noise of the pyroelectric sensor itself, the state of the flame detector can be determined by collecting the noise of the pyroelectric sensor.
Therefore, the embodiment of the invention can judge by collecting the noise signal of the pyroelectric sensor in real time.
S120, determining the state of a current flame detector according to a comparison result of the noise signal and a preset noise threshold, wherein the state of the flame detector comprises a calm state and a non-calm state;
in the embodiment of the invention, the method specifically comprises the following steps:
comparing the noise signal with a preset noise threshold;
if the noise signal exceeds the preset noise threshold, judging that the state of the flame detector is a non-calm state;
otherwise, judging the state of the flame detector to be a calm state.
It should be understood that the preset noise threshold may be set as needed, for example, the noise of the pyroelectric sensor itself may be appropriately expanded by a certain range as the preset noise threshold. The preset noise threshold is used as a basis for whether the pyroelectric sensor is in a response state or not.
When the noise signal of the pyroelectric sensor exceeds the preset noise threshold value, the flame detector is in a non-calm state when detecting high background noise, and if the noise signal of the pyroelectric sensor does not exceed the preset noise threshold value, the flame detector is judged to be in a calm state.
In the embodiment of the invention, the calm state of the flame detector can be specifically understood as that the noise signal of the pyroelectric sensor in the flame detector is low in background noise, and the noise signal has small fluctuation and is stable; the non-calm state can be understood as high background noise, and the noise signal has large fluctuation and is not stable.
S130, judging whether a window is polluted according to whether the pyroelectric sensor receives a light source infrared signal when the flame detector is in a calm state;
in the embodiment of the invention, the method specifically comprises the following steps:
when the flame detector is in a calm state, judging whether the energy of the light source infrared signal absorbed by the pyroelectric sensor exceeds a preset energy threshold;
if yes, judging that the pyroelectric sensor receives the light source infrared signals and judging that the window is not polluted;
if the infrared signal is not exceeded, the pyroelectric sensor is judged to not receive the light source infrared signal, and the window is judged to be polluted.
It should be understood that when the flame detector is in a calm state, it is understood that the background noise is low, the noise signal fluctuation is small, and the flame detector is not affected by rainwater, that is, the optical path self-checking function of the flame detector can be understood to work normally. In the state, whether the current window is polluted can be judged according to whether the energy of the light source infrared signal absorbed by the pyroelectric sensor exceeds a preset energy threshold.
When the energy of the light source infrared signal absorbed by the pyroelectric sensor exceeds the preset energy threshold, the pyroelectric sensor can be understood as receiving the light source infrared signal, and the window is not polluted. When the energy of the light source infrared signal absorbed by the pyroelectric sensor does not exceed the preset energy threshold, the pyroelectric sensor can be understood that the pyroelectric sensor does not receive the light source infrared signal, and the window is polluted.
It should be appreciated that when it is determined that the window is contaminated, the flame detector can send a self-test fault signal to alert the operator to clear the window of contamination.
S140, judging whether the flame detector is in a non-calm state currently or not in a rainy day;
in the embodiment of the invention, whether the rainy day is in the rainy day or not can be identified by constructing a rainy day identification model, and then whether the rainy day is in the rainy day or not is judged according to the rainy day identification model.
For example, the characteristic value of the flame detector window can be extracted by simulating the rain test of different rainfall on the flame detector window sputtering, collecting the noise signal of the pyroelectric sensor, and simulating the rain test of different angles of different rainfall on the flame detector window attack. Combining the extracted characteristic values of the two, and then manufacturing a rainy day recognition model according to the extracted characteristic values.
One construction embodiment of the rainy day recognition model comprises the following steps:
respectively acquiring noise signals of the pyroelectric sensors of the flame detectors after the simulated rain test to form a first acquisition sample;
respectively collecting noise signals of pyroelectric sensors of a plurality of flame detectors under actual different rainy days to form a second collected sample;
performing Fourier change on the first acquired sample and the second acquired sample respectively, and extracting a frequency domain characteristic value;
comparing the frequency domain characteristic value of the first acquired sample with the frequency domain characteristic value of the second acquired sample;
and determining a rainy day recognition model according to the comparison result.
For example, a first collected sample (specifically including 10 noise signals) may be formed by collecting noise signals of respective pyroelectric sensors obtained by 10 flame detectors through the rain experiment, and then a second collected sample (including 10 noise signals) may be formed by collecting noise signals of pyroelectric sensors of 10 flame detectors under actual different rainy days.
And carrying out Fourier transformation on the acquired samples under the two conditions, extracting frequency domain characteristic values of respective noise signals, and comparing the similarity of the frequency domain characteristic values under the two conditions to form a rainy day identification model.
I.e. whether it is rainy or not is judged according to the above-mentioned mode.
Another construction embodiment as a rainy day recognition model includes:
respectively collecting noise signals of the pyroelectric sensors of the flame detectors in a calm state to form a calm sample;
respectively collecting noise signals of pyroelectric sensors of a plurality of flame detectors under actual different rainy days to form a rainy day sample;
training the calm sample and the rainy day sample according to a neural network algorithm;
and determining a rainy day recognition model according to the training result.
In this embodiment, the noise signals of the pyroelectric sensor of the flame detector in a calm state and the noise signals of the pyroelectric sensor in actual different rainy days are collected, and then the calm sample and the rainy day sample are trained through a neural network algorithm to obtain a rainy day identification model.
How to train by the neural network algorithm is well known to those skilled in the art, and will not be described here.
When the flame detector is in a non-calm state and is currently in a rainy day, the noise signal of the pyroelectric sensor is compensated.
It should be understood that when the flame detector is in a "non-calm state", the signal of the pyroelectric sensor is identified by the rainy day identification model, and if the signal is rainy, the flame detector will extract the characteristic value of the signal of the pyroelectric sensor in the rainy day, and compensate the signal of the pyroelectric sensor before the flame identification, so as to eliminate the influence of the rainy day on the pyroelectric sensor.
S150, if the judgment result is that the window is currently in a rainy day, judging that the window is affected by rainwater and is not polluted, and shielding a self-checking fault signal of the flame detector;
it should be appreciated that, since the rain recognition model also needs to be determined through the window, if the rain recognition model can determine the result, it indicates that the rain recognition model is not blocked, i.e., not contaminated. At this time, the flame detector sends out a self-checking fault signal as false alarm, so that the self-checking fault signal of the flame detector under the condition is shielded to avoid misleading operators.
And S160, if the judgment result is that the identification is impossible, and the pyroelectric sensor does not receive the infrared signal of the light source, controlling the flame detector to reenter a calm state.
It should be understood that if the rainy day recognition model fails to recognize whether the rainy day is present, the pyroelectric sensor does not receive the infrared signal of the light source, which indicates that the window is blocked by the foreign object in the rainy day environment. At this time, the flame detector is controlled to reenter the calm state, namely, the self-checking fault signal is not shielded at this time, the self-checking fault signal is processed again according to the detection mode of the flame detector in the calm state, namely, whether the window is polluted or not is judged according to whether the pyroelectric sensor receives the light source infrared signal, and the pyroelectric sensor cannot naturally receive the light source infrared signal at this time because the window is shielded, so that the window is judged to be polluted at this time, and the self-checking fault signal is sent.
In summary, the optical path self-checking method for the flame detector provided by the embodiment of the invention utilizes the pyroelectric sensor in the flame detector to monitor infrared signals of different environments, and can identify the rainy environment through the rainy environment identification model, so that the detector can judge whether a window is blocked or not by utilizing the acquisition of the infrared background of the rainy environment, thereby realizing the optical path self-checking function of the multiband infrared flame detector, avoiding the influence of rain invasion on the detector and outputting fault signals, and further overcoming the defect of the optical path self-checking function of the traditional flame detector, improving the optical path self-checking function and ensuring the pollution degree of the window to be detected more accurately; and the stability of the flame detector is improved, and the maintenance cost and the accessory cost of the flame detector are reduced.
Fig. 3 is a flowchart of a specific implementation process of the optical path self-checking method of the flame detector according to the embodiment of the present invention.
When the flame detector is in a calm state, the optical path self-checking function works normally, and the signal of the pyroelectric sensor is in a stable state. When the signal of the pyroelectric sensor exceeds a set threshold value, the flame detector is in a non-calm state, a rainy day recognition model in the flame detector detects whether the environment is rainy days, if the rainy day signal is detected, the window is judged not to be polluted through the rainy day signal, and only the window is affected by rainwater, at the moment, the flame detector can still report a fire alarm, the performance of the flame detector is not affected, and therefore the fault signal of the light path self-detection is shielded. When the window of the flame detector is shielded by foreign matters in a rainy day environment, the flame detector cannot receive rainy day signals and self-checking light source infrared signals, the flame detector reenters a calm state, the self-checking function of the light path is recovered to be normal, and when the self-checking light source infrared signals of the light path cannot be detected, the window is judged to be polluted, and self-checking fault signals are sent.
The working process of the flame detector optical path self-checking method in the embodiment of the invention is described in detail below by taking a flame detector of a four-band infrared pyroelectric sensor as an example.
(1) Finding threshold K of calm state of pyroelectric infrared sensor in each wave band 1 、K 2 、K 3 And K 4 : the five flame detectors are sequentially arranged outside a darkroom, a sunny day and a cloudy day, signals of the pyroelectric sensors are collected, and average peak-to-peak values and maximum peak-to-peak values of the pyroelectric sensors are taken. Average peak to peakThe value multiplied by a certain coefficient is set as a preset noise threshold value K 1～4 Is made to be more than 1.05 times of the maximum peak value of the respective pyroelectric sensors.
(2) Collecting a rainy day sample, and manufacturing a rainy day identification model: five flame detectors are respectively arranged in a rain box, the motor speed is adjusted, so that the effect of simulating different rainfall is achieved, the angle of a spray header is adjusted, the flame detectors are sprayed at different angles, and a sample is collected. Five flame detectors are placed outdoors to collect sensor signal samples of different actual rainy days. There are two methods for making rainy day identification model, one is to make Fourier transform of pyroelectric sensor signal in rainy day to extract characteristic value T of frequency domain 1_X 、T 2_X 、T 3_X 、T 4_X (X represents a certain frequency value), and a method for judging whether the weather is rainy days is realized by comparing the similarity of the characteristic values; and the other is to train the calm sample and the rainy sample to obtain rainy day identification model parameters through a neural network algorithm, and transplant the model into a flame detector for rainy day identification.
(3) Setting a flag bit F of whether the flame detector is in a calm state Clam When the noise signals of the pyroelectric sensor exceed the preset noise threshold K 1～4 When F Clam And setting 0 to indicate that the flame detector is in a non-calm state, and otherwise is in a calm state. Flag bit F for setting rainy day mode of flame detector Rain . When F Clam When the characteristic value similarity reaches 80% or the neural network model is output as rainy days, F is added to the flame detector before flame identification Rain And setting. When F Rain When=1, the self-checking function output of the shielded optical path is outputted, when F Rain When=0, the optical path self-checking function output is turned on.
(4) Test effect: five flame detectors FDR 1-5 realized by the flame detector light path self-checking method and flame detectors FD 1-5 incapable of shielding rain attack in the prior art are placed outdoors for two months, and then the output information of the flame detectors is read, and the result is shown in the following table 1:
TABLE 1 output information comparison table of the flame detector of the present invention and the flame detector of the prior art
| Flame detector | Number of optical path self-checking faults | Optical path self-checking fault duration |
| FDR1 | 0 | 0 |
| FDR2 | 0 | 0 |
| FDR3 | 0 | 0 |
| FDR4 | 0 | 0 |
| FDR5 | 0 | 0 |
| FD1 | 6 | 23h5min |
| FD2 | 6 | 20h33min |
| FD3 | 6 | 16h26min |
| FD4 | 7 | 19h34min |
| FD5 | 6 | 23h56min |
Therefore, the number of times of the self-checking fault signals sent by the device is obviously higher than that of the invention because the device does not have the function of shielding the self-checking fault signals from false alarm in the rainy days in the prior art. Therefore, the flame detector realized by the flame detector light path self-checking method can effectively avoid the influence of rain invasion on the detector from false alarm of self-checking fault signals.
As another embodiment of the present invention, there is provided a flame detector optical path self-checking device for implementing the flame detector optical path self-checking method described above, wherein the flame detector includes a window, an infrared light source, a pyroelectric sensor and a mirror reflector mounted thereon, the infrared light source and the pyroelectric sensor are disposed on one side of the window, the mirror reflector is disposed on the other side of the window, and the flame detector optical path self-checking device includes:
the signal acquisition module is used for acquiring the noise signal of the pyroelectric sensor in real time;
the state determining module is used for determining the state of the current flame detector according to the comparison result of the noise signal and a preset noise threshold value, wherein the state of the flame detector comprises a calm state and a non-calm state;
the judging module is used for judging whether the window is polluted according to whether the pyroelectric sensor receives the light source infrared signals or not when the flame detector is in a calm state;
the rainy day identification module is used for judging whether the flame detector is currently in a rainy day or not when the flame detector is in a non-calm state;
the judging module is used for judging that the window is affected by rainwater and is not polluted if the judging result is that the window is currently in a rainy day, and shielding a self-checking fault signal of the flame detector;
and the control module is used for controlling the flame detector to reenter the calm state if the judging result is unrecognizable.
The working principle and process of the flame detector optical path self-checking device provided by the invention can refer to the description of the flame detector optical path self-checking method, and the description is omitted here.
As another embodiment of the present invention, there is provided a flame detector including: the device comprises a window, an infrared light source, a pyroelectric sensor, a mirror reflector and the flame detector optical path self-checking device, wherein the window, the infrared light source, the pyroelectric sensor, the mirror reflector and the flame detector optical path self-checking device are arranged on the window, the infrared light source and the pyroelectric sensor are arranged on one side of the window, the mirror reflector is arranged on the other side of the window, and the pyroelectric sensor is in communication connection with the flame detector optical path self-checking device.
The flame detector provided by the embodiment of the invention adopts the flame detector optical path self-checking device, so that the influence of rain invasion on the detector on false alarm self-checking fault signals can be effectively avoided, the defect of the optical path self-checking function of the existing flame detector is overcome, and the optical path self-checking function is perfected.
Preferably, the flame detector optical path self-checking device specifically comprises a singlechip.
The working principle of the flame detector provided by the invention can be referred to the previous description, and the description is omitted here.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (7)
1. The utility model provides a flame detector light path self-checking method which characterized in that is applied to the flame detector, the flame detector includes window, infrared light source, pyroelectric sensor and the mirror surface reflector of installing on it, infrared light source and pyroelectric sensor set up in one side of window, the mirror surface reflector sets up the opposite side of window, flame detector light path self-checking method includes:
acquiring a noise signal of the pyroelectric sensor in real time;
determining the state of a current flame detector according to the comparison result of the noise signal and a preset noise threshold value, wherein the state of the flame detector comprises a calm state and a non-calm state;
when the flame detector is in a calm state, judging whether the window is polluted according to whether the pyroelectric sensor receives the infrared signals of the light source or not;
judging whether the flame detector is in a non-calm state or not currently in a rainy day or not;
if the judging result is that the window is currently in a rainy day, judging that the window is affected by rainwater and is not polluted, and shielding a self-checking fault signal of the flame detector;
if the judgment result is that the identification is impossible, and the pyroelectric sensor does not receive the infrared signal of the light source, the flame detector is controlled to reenter a calm state;
wherein, judging whether the current rainy day comprises:
constructing a rainy day recognition model;
judging whether the current rainy day exists according to the rainy day recognition model;
the construction of the rainy day recognition model comprises the following steps:
respectively acquiring noise signals of the pyroelectric sensors of the flame detectors after the simulated rain test to form a first acquisition sample;
respectively collecting noise signals of pyroelectric sensors of a plurality of flame detectors under actual different rainy days to form a second collected sample;
performing Fourier change on the first acquired sample and the second acquired sample respectively, and extracting a frequency domain characteristic value;
comparing the frequency domain characteristic value of the first acquired sample with the frequency domain characteristic value of the second acquired sample;
determining a rainy day recognition model according to the comparison result;
or, the building of the rainy day recognition model comprises the following steps:
respectively collecting noise signals of the pyroelectric sensors of the flame detectors in a calm state to form a calm sample;
respectively collecting noise signals of pyroelectric sensors of a plurality of flame detectors under actual different rainy days to form a rainy day sample;
training the calm sample and the rainy day sample according to a neural network algorithm;
and determining a rainy day recognition model according to the training result.
2. The method of claim 1, wherein determining the current flame detector state based on the comparison of the noise signal and a predetermined noise threshold comprises:
comparing the noise signal with a preset noise threshold;
if the noise signal exceeds the preset noise threshold, judging that the state of the flame detector is a non-calm state;
otherwise, judging the state of the flame detector to be a calm state.
3. The method of claim 1, wherein when the flame detector is in a calm state, determining whether the window is contaminated according to whether the pyroelectric sensor receives the light source infrared signal, comprises:
when the flame detector is in a calm state, judging whether the energy of the light source infrared signal absorbed by the pyroelectric sensor exceeds a preset energy threshold;
if yes, judging that the pyroelectric sensor receives the light source infrared signals and judging that the window is not polluted;
if the infrared signal is not exceeded, the pyroelectric sensor is judged to not receive the light source infrared signal, and the window is judged to be polluted.
4. The method of claim 1, wherein a self-test fault signal is emitted when the window is determined to be contaminated.
5. The flame detector optical path self-checking method according to claim 1, further comprising:
and when the flame detector is in a non-calm state and is currently in a rainy day, compensating the noise signal of the pyroelectric sensor.
6. A flame detector optical path self-checking device for implementing the flame detector optical path self-checking method according to any one of claims 1 to 5, characterized in that the flame detector comprises a window, an infrared light source, a pyroelectric sensor and a mirror reflector mounted thereon, wherein the infrared light source and the pyroelectric sensor are arranged on one side of the window, the mirror reflector is arranged on the other side of the window, and the flame detector optical path self-checking device comprises:
the signal acquisition module is used for acquiring the noise signal of the pyroelectric sensor in real time;
the state determining module is used for determining the state of the current flame detector according to the comparison result of the noise signal and a preset noise threshold value, wherein the state of the flame detector comprises a calm state and a non-calm state;
the judging module is used for judging whether the window is polluted according to whether the pyroelectric sensor receives the light source infrared signals or not when the flame detector is in a calm state;
the rainy day identification module is used for judging whether the flame detector is currently in a rainy day or not when the flame detector is in a non-calm state;
the judging module is used for judging that the window is affected by rainwater and is not polluted if the judging result is that the window is currently in a rainy day, and shielding a self-checking fault signal of the flame detector;
and the control module is used for controlling the flame detector to reenter the calm state if the judging result is unrecognizable.
7. A flame detector, comprising: the window, the infrared light source, the pyroelectric sensor, the mirror reflector and the flame detector optical path self-checking device of claim 6 are arranged on the window, the infrared light source and the pyroelectric sensor are arranged on one side of the window, the mirror reflector is arranged on the other side of the window, and the pyroelectric sensor is in communication connection with the flame detector optical path self-checking device.
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